/*

 * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.

 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/evp.h>

#include <openssl/ec.h>

#include <openssl/bn.h>

#ifndef OPENSSL_NO_STDIO

int ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x, int off)

{

    BIO *b;

    int ret;

    if ((b = BIO_new(BIO_s_file())) == NULL) {

        ECerr(EC_F_ECPKPARAMETERS_PRINT_FP, ERR_R_BUF_LIB);

        return 0;

    }

    BIO_set_fp(b, fp, BIO_NOCLOSE);

    ret = ECPKParameters_print(b, x, off);

    BIO_free(b);

    return ret;

}

int EC_KEY_print_fp(FILE *fp, const EC_KEY *x, int off)

{

    BIO *b;

    int ret;

    if ((b = BIO_new(BIO_s_file())) == NULL) {

        ECerr(EC_F_EC_KEY_PRINT_FP, ERR_R_BIO_LIB);

        return 0;

    }

    BIO_set_fp(b, fp, BIO_NOCLOSE);

    ret = EC_KEY_print(b, x, off);

    BIO_free(b);

    return ret;

}

int ECParameters_print_fp(FILE *fp, const EC_KEY *x)

{

    BIO *b;

    int ret;

    if ((b = BIO_new(BIO_s_file())) == NULL) {

        ECerr(EC_F_ECPARAMETERS_PRINT_FP, ERR_R_BIO_LIB);

        return 0;

    }

    BIO_set_fp(b, fp, BIO_NOCLOSE);

    ret = ECParameters_print(b, x);

    BIO_free(b);

    return ret;

}

#endif

static int print_bin(BIO *fp, const char *str, const unsigned char *num,

                     size_t len, int off);

int ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off)

{

    int ret = 0, reason = ERR_R_BIO_LIB;

    BN_CTX *ctx = NULL;

    const EC_POINT *point = NULL;

    BIGNUM *p = NULL, *a = NULL, *b = NULL, *gen = NULL;

    const BIGNUM *order = NULL, *cofactor = NULL;

    const unsigned char *seed;

    size_t seed_len = 0;

    static const char *gen_compressed = "Generator (compressed):";

    static const char *gen_uncompressed = "Generator (uncompressed):";

    static const char *gen_hybrid = "Generator (hybrid):";

    if (!x) {

        reason = ERR_R_PASSED_NULL_PARAMETER;

        goto err;

    }

    ctx = BN_CTX_new();

    if (ctx == NULL) {

        reason = ERR_R_MALLOC_FAILURE;

        goto err;

    }

    if (EC_GROUP_get_asn1_flag(x)) {

        /* the curve parameter are given by an asn1 OID */

        int nid;

        const char *nname;

        if (!BIO_indent(bp, off, 128))

            goto err;

        nid = EC_GROUP_get_curve_name(x);

        if (nid == 0)

            goto err;

        if (BIO_printf(bp, "ASN1 OID: %s", OBJ_nid2sn(nid)) <= 0)

            goto err;

        if (BIO_printf(bp, "\n") <= 0)

            goto err;

        nname = EC_curve_nid2nist(nid);

        if (nname) {

            if (!BIO_indent(bp, off, 128))

                goto err;

            if (BIO_printf(bp, "NIST CURVE: %s\n", nname) <= 0)

                goto err;

        }

    } else {

        /* explicit parameters */

        int is_char_two = 0;

        point_conversion_form_t form;

        int tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(x));

        if (tmp_nid == NID_X9_62_characteristic_two_field)

            is_char_two = 1;

        if ((p = BN_new()) == NULL || (a = BN_new()) == NULL ||

            (b = BN_new()) == NULL) {

            reason = ERR_R_MALLOC_FAILURE;

            goto err;

        }

        if (!EC_GROUP_get_curve(x, p, a, b, ctx)) {

            reason = ERR_R_EC_LIB;

            goto err;

        }

        if ((point = EC_GROUP_get0_generator(x)) == NULL) {

            reason = ERR_R_EC_LIB;

            goto err;

        }

        order = EC_GROUP_get0_order(x);

        cofactor = EC_GROUP_get0_cofactor(x);

        if (order == NULL) {

            reason = ERR_R_EC_LIB;

            goto err;

        }

        form = EC_GROUP_get_point_conversion_form(x);

        if ((gen = EC_POINT_point2bn(x, point, form, NULL, ctx)) == NULL) {

            reason = ERR_R_EC_LIB;

            goto err;

        }

        if ((seed = EC_GROUP_get0_seed(x)) != NULL)

            seed_len = EC_GROUP_get_seed_len(x);

        if (!BIO_indent(bp, off, 128))

            goto err;

        /* print the 'short name' of the field type */

        if (BIO_printf(bp, "Field Type: %s\n", OBJ_nid2sn(tmp_nid))

            <= 0)

            goto err;

        if (is_char_two) {

            /* print the 'short name' of the base type OID */

            int basis_type = EC_GROUP_get_basis_type(x);

            if (basis_type == 0)

                goto err;

            if (!BIO_indent(bp, off, 128))

                goto err;

            if (BIO_printf(bp, "Basis Type: %s\n",

                           OBJ_nid2sn(basis_type)) <= 0)

                goto err;

            /* print the polynomial */

            if ((p != NULL) && !ASN1_bn_print(bp, "Polynomial:", p, NULL,

                                              off))

                goto err;

        } else {

            if ((p != NULL) && !ASN1_bn_print(bp, "Prime:", p, NULL, off))

                goto err;

        }

        if ((a != NULL) && !ASN1_bn_print(bp, "A:   ", a, NULL, off))

            goto err;

        if ((b != NULL) && !ASN1_bn_print(bp, "B:   ", b, NULL, off))

            goto err;

        if (form == POINT_CONVERSION_COMPRESSED) {

            if ((gen != NULL) && !ASN1_bn_print(bp, gen_compressed, gen,

                                                NULL, off))

                goto err;

        } else if (form == POINT_CONVERSION_UNCOMPRESSED) {

            if ((gen != NULL) && !ASN1_bn_print(bp, gen_uncompressed, gen,

                                                NULL, off))

                goto err;

        } else {                /* form == POINT_CONVERSION_HYBRID */

            if ((gen != NULL) && !ASN1_bn_print(bp, gen_hybrid, gen,

                                                NULL, off))

                goto err;

        }

        if ((order != NULL) && !ASN1_bn_print(bp, "Order: ", order,

                                              NULL, off))

            goto err;

        if ((cofactor != NULL) && !ASN1_bn_print(bp, "Cofactor: ", cofactor,

                                                 NULL, off))

            goto err;

        if (seed && !print_bin(bp, "Seed:", seed, seed_len, off))

            goto err;

    }

    ret = 1;

 err:

    if (!ret)

        ECerr(EC_F_ECPKPARAMETERS_PRINT, reason);

    BN_free(p);

    BN_free(a);

    BN_free(b);

    BN_free(gen);

    BN_CTX_free(ctx);

    return ret;

}

static int print_bin(BIO *fp, const char *name, const unsigned char *buf,

                     size_t len, int off)

{

    size_t i;

    char str[128 + 1 + 4];

    if (buf == NULL)

        return 1;

    if (off > 0) {

        if (off > 128)

            off = 128;

        memset(str, ' ', off);

        if (BIO_write(fp, str, off) <= 0)

            return 0;

    } else {

        off = 0;

    }

    if (BIO_printf(fp, "%s", name) <= 0)

        return 0;

    for (i = 0; i < len; i++) {

        if ((i % 15) == 0) {

            str[0] = '\n';

            memset(&(str[1]), ' ', off + 4);

            if (BIO_write(fp, str, off + 1 + 4) <= 0)

                return 0;

        }

        if (BIO_printf(fp, "%02x%s", buf[i], ((i + 1) == len) ? "" : ":") <=

            0)

            return 0;

    }

    if (BIO_write(fp, "\n", 1) <= 0)

        return 0;

    return 1;

}